I'm thinking of studying for another Master's degree next year in Oz. I'll be on a student visa and I understand I can work up to 20 hours per week.

I have an MA in TESOL and over thirteen years experience (4 years post-MA) and will try to offset my living expenses by teaching casually either at universities or TAFE or whatever else is available. I'm curious about what kind of hourly wage I could expect with such qualifications.

Since I'll be busy studying I doubt if I'd have time to teach 20hours/week, especially if it involves hopping to different locations, but I still think a reasonable workload would be 12hours/wk.

I'll be taking my family with me -- two children aged 4 and 1. I'm looking at renting a modest house for roughly $200/wk. and will enrol our oldest in a kindergarten ($6200/yr). I hope that I could at least find a job to offset some of these costs.

In Adelaide you could earn around $260 per day for 3 hours of teaching, 2 hours of consultations and 2 hours of preparation - the rate is $55 per hour but you're not paid for preparation. This is a casual contract rate and I think the rate in migrant education is similar.

I think the English College Teachers Award is a national one.
Living costs [mainly rent] vary greatly. The smaller cities are the best, but then there's probably fewer jobs. You'd struggle to rent a house in most cities for $200; a decent apartment would be doable aside from Sydney and maybe Melbourne.

I'm pretty much set on living in Brisbane. The Master's in Teaching offered at Griffith is attractive to me, but I sometimes wonder why it is so much cheaper than other programs offered. I'd be grateful to get some feedback on anyone with inside knowledge of this course.

I had already looked in the link loswich provided and $200/wk homes do exist in Brisbane, but like I mentioned in my OP, they are very modest homes.

I also figure that Brisbane would give me a greater chance of finding ESL work compared to other options like Darwin, Perth, or even non-capital towns like Cairns, Townsville, Toowoomba, etc.

The rate I was quoting was not at a NEAS accredited school. That was at an English Language Centre attached to a university. The pay is a casual instructor rate.

The NEAS award is Australia wide and is worked out on qualifications + experience. It has been mentioned elsewhere that Elicos schools are more likely to hire the cheaper, less experienced teachers at $35 an hour than more experienced teachers at $55 per hour - makes sense if you're the boss.

I would suggest looking into universities where they need experienced teachers to teach EAP and where qualifications and experience are valued (even if only a little bit )